Subtract 81/30 from 32/40
1st number: 32/40, 2nd number: 2 21/30
32/40 - 81/30 is -19/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 30 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
32/40 = 32 × 3/40 × 3 = 96/120 - Likewise, for the 2nd fraction, since 30 × 4 = 120,
81/30 = 81 × 4/30 × 4 = 324/120 - Subtract the two like fractions:
96/120 - 324/120 = 96 - 324/120 = -228/120 - After reducing the fraction, the answer is -19/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 64/40-81/30 32/80-81/30 32/40-81/60 96/40-81/30 32/40-81/90